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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db130d0941a50b4a2da7c4cfd703948f9ee7a6480a5ba9c09a7d07db9eacbe9f' 
  AND token = 'tLDB2w3FPIElJTxzHS3VTwsYrM6/ALRX+y0vW0e6OU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}